ChemPhys 173 - Semester Review

Second Semester, 2013-2014 

 

Background Information

The physics exam for ChemPhys 173 will be during the week of Finals. The exam will be a 90-minute exam covering all topics learned during the year. The majority of questions will focus on second semester topics. Detailed questions and problems regarding topics from the first three units of the school year are not likely; rather, it is more likely that major ideas from those units would be targetted. The exam will be started the moment the exam period begins and will be collected at the end of the 90-minute exam period. Extra time will not be alloted on these exams. If there are special circumstances that require that you are permitted additional time, then see Mr. Henderson privately before the day of the exam to discuss those circumstances and to make arrangments.

Most of the questions are multiple-choice. Eight of the approximately 90 questions will not be multiple choice; rather, you will determine the numerical answer to a physics word problem. Many of the multiple choice questions include up to 10 possible choices - from a through e and such choices as ab, ac, ad, etc. Planning to guess on questions is unlikely to be a wise alternative to planning to prepare. All questions are worth the same amount of credit; there is no partial credit on any of the questions. The exam is not likely to be curved; it would not be surprising if there were a few perfect or near-perfect scores. Your exam score will be 20% of your semester grade in Physics.


Contents of Exam

There are ~90 questions on the final exam. The questions cover the following topics:

Topics

Approx. # of Qs

Newton's Laws and Their Applications:

  • Newton's first law - concept of inertia; relationship to mass
  • Newton's second law - factors affecting acceleration; meaning of net force; simple computations
  • Newton's third law - action-reaction; identifying force pairs in an interaction
  • Free-body diagrams and analysis - computing acceleration from known force values or determining an individual force value from a known acceleration
  • Combining a = Fnet/m with kinematics
  • Friction - static vs. kinetic; coefficient of friction; equation; determining Ffrict
  • Air resistance, teminal velocity
  • Equilibrium - definition/concept; analyzing static situations (e.g., hanging signs)
  • Dynamic situations with forces at angles; SOH CAH TOA and a = Fnet/m
  • Inclined plane problems - resolution of force of gravity; conceptual understanding; computations; analyzing to determine the acceleration
  • Two-body problems - system analysis to determine acceleration; individual analysis to determine tension force or other forces

~20 Qs

Circular Motion and Gravitation:

  • Uniform circular motion - conceptual understanding of vector quantities - v, a, and Fnet; importance of inertia in understanding the sensation of a centrifugal pull (careful); centripetal force
  • Simple computations of quantities such as v, a, Fnet, T, etc.
  • Mathematical analysis of physical situations involving motion in circles; use of a = Fnet/m and free-body diagrams to solve problems
  • Newton's law of universal gravitation - universal nature of gravity; conceptual understanding of the m-d-F relationships; simple computations
  • Satellite motion - variables effecting T, v, a, Fnet; role of gravity
  • Kepler's laws and their use to describe planets and other satellites
  • Weightlessness - conceptual understanding of the cause of this sensation

~14 Qs

Static Electricity:

  • Charge interactions between like- and opposite-charges, etc.
  • Conductors vs. insulators
  • Methods of charging objects - friction, conduction (contact) and induction
  • Grounding
  • Polarization
  • Electric force and Coulomb's law calculations
  • Electric field - definition/concept, equation, units, simple computations
  • Electric field lines (SKIP for 2013-2014 exam)
  • Lightning rods and electric fields (SKIP for 2013-2014 exam)

~14 Qs 

Work and Energy:

  • Work - definition, equation, units, simple computations
  • Power - definition, equation, units, simple computations
  • Potential energy - definition, equation, units, simple computations
  • Kinetic energy - definition, equation, units, simple computations
  • Work-energy relationship; conservative vs. non-conservative forces; work-energy equation and its use in solving problems
  • Work-energy bar charts
  • Conservation of energy - equation, concepts, use as a tool of predicting information about speed or height
~16 Qs 

Momentum Conservation and Collisions:

  • Momentum - definition, equation, units, simple computations
  • Impulse - definition, equation, units, simple computations; relationship to momentum change
  • Newton's third law - relationship to collisions
  • Momentum conservation; isolated systems; use of p conservation in analysis of collisions
  • Elastic collisions vs. inelastic collisions; criteria for each; mathematical analysis
  • Two-dimensional collisions; vector/mathematical analysis
~13 Qs 

Electric Circuits:

  • Electric potential - definition, equation, units, simple computations; relationship to potential energy and to current, resistance, power, etc.
  • Two requirements for a circuit
  • Current - definition, equation, units, simple computations; relationship to voltage, resistance, power, etc.
  • Resistance - definition, equation, units, simple computations; variables effecting the amount of resistance in a wire; relationship to voltage, current, power, etc.
  • Power - definition, equation, units, simple computations; relationship to energy, voltage, resistance, current, etc.
  • Energy - power - cost calculations
  • Series circuits - diagrams; definitions; equivalent resistance; rules regarding current and voltage for entire circuit and for individual resistors
  • Parallel circuits - diagrams; definitions; equivalent resistance; rules regarding current and voltage for entire circuit and for individual resistors
~13 Qs 

Science Reasoning:

This includes specific passage-based questions as well as questions that are sprinkled throughout the test in which science reasoning (and not memorized information) is used to answer the question.
  • Interpolating and extrapolating from data and graphs
  • Identifying conclusions that are consistent with presented data
  • Identifying simple and complex relationships from presented data
  • Combining info from two or more data presentations (graph, data table, diagram)
  • Using a simple or complex relationship to make a prediction
  • Predicting the result of an additional trial in an experiment
  • Analyzing an experiment to identify the dependent and independent variables, the assumptions, and the error involved
  • Extending the conclusions of an experiment in order to make a prediction regarding a new situation
  • Etc.
  • Etc.
~10 Qs

Several of the questions require the use of a calculator; complex analysis are not common. Many quantitative questions are accompanied by a diagram - e.g., a free-body diagram or a circuit diagram or a before/after- collision diagram - which forms the basis of the computation. When a calculation is involved, it is usually a straight-forward calculation. There are very few four-step (and greater) problems (if any). Lots of questions can be answered quickly. Many questions are easy to very easy; others are of medium difficulty; few (if any) are complex; and none (that's right, NONE!) are impossible. The questions are much more general than what you would normally find on unit tests; small nuances are not the focus of the exam. Keep in mind that all questions are worth the same number of points. So do not blow 10 minutes trying to solve a two-body problem at the expense of other easier questions. If such a problem is that difficult for you, then count it as a loss and continue on with those questions which you do know. Return to the troublesome questions at the end of the test.

The following math equations will be provided on the test. You will be responsible for knowing the meaning of the symbols.

d = [(vi + vf) / 2] • t
d = vi • t + 0.5 • a • t2
vf = vi + a • t
vf2 = vi 2 + 2 • a • d
Fnet = m • a
Fgrav = m • g
Ffrict = mu • Fnorm
SOH CAH TOA
a = v2/R
Fgrav = G • M1 • M2 / d2
G = 6.67 • 10-11 N•m2/kg2
g = G • M / R2
v = SQRT (G • M / R)
T2/R3 = k
Felect = k • Q1 • Q2 / d2
k = 9.0 • 109 N•m2/C2
E = F / q
E = k • Q / d2
Qelectron = -1.6 • 10-19 C

Fparallel = m • g • sine(theta)

Fperp = m • g • cosine(theta)

SOH CAH TOA
PE = m • g • h
KE = 0.5 • m • v2
W = F • d • cos(Theta)
P = W / t
KEi + PEi + Wnc = KEf + PEf
F • t = m • (∆v)
p = m • v
I = Q / t
∆V = (∆PE) / Q
Qelectron = 1.6 • 10-19 C
P = I • ∆V = (∆E) / t = I2 • R = ∆V2 / R
Req = Ra + Rb + Rc + ...
1/Req=1/ Ra +1/ Rb+1/ Rc + ...
∆V = I • R


How to Prepare

There are numerous ways to prepare for the test. The best ways are those which help you learn the material. This will be different for differnt learners with different learning styles. The main thing is to devote some time to the preparation process. There are numerous preparation tasks which can be done, all of which should help. The following provides some ideas:


Some absolute imperatives include:

 

 

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